SQL Server Installed Date in the system or Host

Finding SQL Server Installed Date

You can find Created date and expire date

select create_date ,DATEADD(dd,180,create_date)expire_date from sys.server_principals where name='NT AUTHORITY\SYSTEM'

You can find installed Date

SELECT createdate AS SQLServerInstalled_Date FROM   sys.syslogins WHERE  sid = 0x010100000000000512000000

You can give this Query also

SELECT * FROM   sys.syslogins WHERE name='NT AUTHORITY\SYSTEM'

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